maintainer-feedback requested: [Bug 291449] www/qt6-webengine: Fails to build on recent main

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-kde (group)
<kde at FreeBSD.org> for maintainer-feedback:
Bug 291449: www/qt6-webengine: Fails to build on recent main
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291449



--- Description ---
Formerly, the build exhibited the same error as Bug291296.
But even after offending commit was reverted at base
fc88be257e30c3e3c01f25ec3a3a6e7933b40c54, still broken with different failure
mode like below.

In file included from
../../../../../qtwebengine-everywhere-src-6.9.3/src/3rdparty/chromium/pdf/pdf_v
iew_web_plugin.cc:5:
In file included from
../../../../../qtwebengine-everywhere-src-6.9.3/src/3rdparty/chromium/pdf/pdf_v
iew_web_plugin.h:32:
In file included from
../../../../../qtwebengine-everywhere-src-6.9.3/src/3rdparty/chromium/pdf/pdfiu
m/pdfium_engine_client.h:9:
In file included from /usr/include/c++/v1/uchar.h:48:
/usr/include/uchar.h:36:23: error: cannot combine with previous 'char'
declaration specifier
typedef unsigned char char8_t


Maybe the root cause is in base (or compiler version dependent), but as I
cannot determine it yet, filing this from the aspect of failure mode.